• Optical lens:easy to use, better demonstrate the optical principles and effects, easy to use,physical optical lens
• Physics teaching :it is a a great teaching tool for school, learning about the properties of light,physical teaching equipment
• Physical optical experiment: and unique design, workmanship, convenience to use,concave lens
• Convex lens:it is explain the knowledge of physical optics with experiments,physical convex lens
• Physical convex lens:it is a great tool for students to learn physics formula and the principle of light refraction,physics teaching